Nothing I have seen in the series suggests to me that any of the women coming into power have selfishly sacrificed their children for their own gain. And I have not suggested that any of them have done so. Cersi did not want ANY of her children to die. Daenerys sure as hell did NOT want her son to die. Sansa and Yara will come into power eventually, but as yet, neither of them have children. Margaery would not have wanted to sacrifice a child for personal gain. The only one who was in to child sacrifice was the Red Witch, but it was someone else's child which was sacrificed.
Dany instructed Jorah Mormont to bring her inside the tent. At the time, there were plenty of Dothraki women around her who a) gave birth themselves, b) attended a birth because the Dothraki raped pretty much anything, or c) had a mother who told them about it. Repeatedly. In detail. Stressing the hours upon hours of pain and suffering just to birth them.
And even after Dany witnesses Khal Drogo not recovering from his wound under the “care” of Marwyn’s trained mage putting on a shadow show for a bunch of ignorant and superstitious Mongols, er, Dothraki — and all those other women around — Dany’s first thought is go back to the same mage who didn’t successfully heal her husband.
Then she’s told afterwards that she didn’t birth a baby, but a deformed stillborn half-dragon. Good thing the mage/abortionist was there! /s
No, Dany’s constant poor decisions led her to sacrificing her child. She knew full well what was going to happen because the mage told her to stay out of the tent. She’s a loose cannon who will always default to destruction first unless she’s guided otherwise. And someone needs to have the right temperament to be that kind of advisor.
Even though Cersei was given a specific “prophecy” by Maggy the Frog, she still put her children in danger and designed situations to risk her children for her own personal gain. Another long litany of bad decisions that got her children killed so she could be queen. They were her true rivals to the throne. We’re told time and time again about how much she loves her children but none of her actions match that at all.
In this world, we call them Third Wave Feminists.